A project commemorating Yokohama City's 150th anniversary. On Planet Abel, humans and robots coexist. One day, a mysterious stowaway aboard a transport vessel attempts to invade the planet, but is discovered by Apollo (Hayato Ichihara), a robot who resembles a human, and Mikaru (Aya Ueto), a human who resembles a robot. The stowaway possessed a memory chip containing the latest camouflage software, the mysterious "Cipher" OS. Apollo takes the Cipher chip simply for fun, unaware of the trouble he is inviting. He suddenly begins acting strangely, while Mikaru has no idea what is wrong or that Cipher is the cause. What exactly is Cipher? What secrets does it hold? Apollo and Mikaru will unravel a mystery spanning the past, present, and future to find out.